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“Aurora” PowerPoint Presentation
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“Aurora”

“Aurora”

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“Aurora”

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Presentation Transcript

  1. “Aurora”

  2. Aurora • Auroras are natural light displays in the sky. • In northern latitudes, it is called Aurora Borealis. • In southern latitudes, it is called Aurora Australis. • Auroras are commonly visible between 65 to 72 degrees north and south latitudes.

  3. The Aurora Borealis • A magnificent aurora display in October 2001 in the Northern Latitudes.

  4. The Aurora Australis • The magical Southern lights of aurora australis captured at 24 November 2001 at Wellington, New Zealand.

  5. Auroral Mechanism • The sun emits a continuous stream of charged particles called the solar wind. • This wind interacts with the magnetic field of the earth by constantly bombarding it. • The solar wind collides with the atoms and molecules in the upper atmosphere. • The collision between the solar wind and the earth’s magnetic field ionize the atoms and molecules, releasing light.

  6. Auroral Mechanism • Here is the solar wind colliding with the magnetosphere of the Earth.

  7. Aurora at Lower Latitudes • The plasma accumulates within the magnetosphere, forming plasma sheet. • The stronger the solar wind, the larger and closer to the Earth the plasma sheet and the stronger the geomagnetic storm in the magnetosphere. • As a result of the stronger storm, Aurora can also be seen at lower latitudes.

  8. Aurora at Lower Latitudes • This Aurora is over a point on Earth located at 50.6 degrees north latitude and 15.1 degrees east longitude.

  9. Origin of Aurora • The origin of Aurora is the upper atmosphere of the Earth. • The origin of Aurora is 93 million miles (143 million kilometers) from the Earth. • The Aurora Polaris have roughly a radius limit of 2500 miles from their respective magnetic poles. • The location of aurora can move 500 km in less than a minute during magnetic storms.

  10. Origin of Aurora • Filaments of the aurora in 2002 July 2. The filaments and their equal distances from each other show the electric origin similar to red sprites. No branches are there.

  11. End of presentation 